Having fun hacking with it so far, but I thought I'd bring up one compatibility glitch that hit me early on:
The definition of 'date' in arc.arc assumes a BSD-compatible 'date' binary on the host system. Unfortunately, the allowed arguments for GNU date are quite different. AFAICT, it is in fact impossible to convert the epoch-seconds timestamp format into a formatted date using the GNU version of the utility. Since the bundled web server uses the 'date' function to generate logfile names, any attempt to run a webapp on Linux immediately blows up.
I've hacked up a new implementation at the MzScheme layer using native date structs, but it would probably be worth porting a more complete date/time logic library to Arc, and relying on something like a native 'current-milliseconds' call only.
